The Marshall V-R81PA is a rack mountable unit that has a 7.9" active matrix LCD panel with auto NTSC/PAL recognition and 4 separate audio input channels. The video section has two composite video inputs and one S-Video input, each with active loop through feature. The four audio channels are inputted via the 4 balanced XLR inputs, and have a passive loop through for each channel.

Simultaneous visual monitoring of the 4 audio channels is obtained using the LED bar graph display. Each speaker can output any of the four audio channels and selected channel output is indicated by a highly visible LED number display. Complete controls for color, tint, contrast, and brightness are provided via an on-screen menu. The unit includes power supply, manual and fits into standard EIA 19" rack, at 4U high.